Stove



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. 2 Sheets Patented Mar M. JAHN.v

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(No Model.)

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No. 599,799. Patented Mar. 1,1898.

" UNITED STATES PATENT OFFICE.;

MAx JAHrLIoF LEIPsIoPLAGWITz, GERMANY.

STOVE.

SPECIFICATION forming part of Letters Patent No. 599,709, dated March 1,1898.

Application ned october e, `1896.

To all whom it may concern:

Be it known that I, MAX JAHN, asubject ofv the King of Saxony, residingat Lei-psic-Plagwitz, Saxony, Germany, have made a new and usefulImprovement in Stoves, of which the following is a fulland clearspecification.

My invention'relates especially to improvements upon a patent granted tome, No. 522,015, dated June 26, 1894, wherein a cen-A tral air-tube isencircled spirally by alternate heating and air conduits communicating,respectively,with the fire-chamber of the stove and the surroundingexterior air of the room to be heated; and the improvement consistsparticularly in the arrangement of thel rechamber in connection with thecentral and` spiral heating-conduits, in the air and draft regulatingappliances connected. therewith, and in means for discharging andcirculating theVhighly-heated and the partially-consumed gases andthoroughly commingling them in their exit from and around there-chambem.

In the accompanying drawings, which illustrate my invention, Figure 1 isa central vertical section of my improved stove ;V Fig. 2, an enlargedvertical section of the cap and upper plates of the heating-drum; Fig.3, a perspective view of the lowermost drum-section and part of the oneabove it, showing the spiral vplates and interior connections;`Fig. 4, aperspective view of the base cap or section for connecting the base anddrum and also showing the feed-spout connected therewith, and Fig. V54 aperspective view of the feed-spout and the air and smoke separatingplate to fit the base-cap. l o

' The stove herein shown is built up of 'a series of rin g-sectionsforming the heating-drum A and of other sections hereinafter describedforming the base B, which comprises the body ofthe stove, a centralsection of the base providing a firechamber C, which is of novelconstruction, and a Vgrate and ash-pan section D, forming the bottomring, which rests upon the foot-ring E and may be set or connectedtherewith in any well-known or preferred manner.

The heating-drum A has a central air-fine F, the outer surface of whichhas a double series of ledges ff, and the inner surface of the severalsections of said heating-drum have corresponding ledges a ci, which areadapted,

serai 110,608,025. (No modem when fitted together, to provide doubleparallel approximately disposed tracks, upon which may be securelysupported curved or helicoidal plates or metal sheets g and h tospirallfy encircle the said central air-fine F and provide two spiralpassages of unequal area within the heating-drum. The space between saidhot-air passages being divided by vertical partitions h', as shown inFig. 3, one of the aforesaid passages forms the spiralcombustion-conduit G, connected to the base and lire-chamber, and theother forms the spiral air-heating conduit H, having inletapertures Hl`to receive and similar outletapertures H2 to discharge in horizontalplanes the exterior air of the room'after presenting it to the surfacesof the spiral heating-conduit H in a simple, rapid, and effectivemanner, the partitions h' within the air-passage .serving to throw theair out of the drum after it has passed once around the central airue.

The central air-nue F is supported at its lower end upon the horizontalprojection la of a feed-spout K, connected to the fire-chamber, and issupported at the top on an inner projection a of the cap-section A,which latter fits upon the upper section of the heatingdrum A and in turnsupports the dome-section A2 of said cap, which has a central openingflange a2, upon which is fitted the stovepipe A2, -which carries off thesmoke or inal products of combustion. As shown clearly in Fig. 1 and bydetail in Fig. 2, the domesection A2 has openings a2 on one side toreceive the smoke from the combustion-conduit G, and openings a4 on theopposite side to receive the heated air both from the central airilue Fand also from the top extremity of the spiral heating-conduit H, thesaid dome-section being provided with apertures a5 therein, throughWhich the heated air is conducted into the room.

The bottom plateA g2 of thesmoke-conduit G rests upon the ledge k2 ofthe feed-spout K and passes around over a vertical partition h4 of ahorizontal base-plate B4, which ts in the base-cap B5, the latterserving to connect the upper section of the base B with the'lowersection A5 of the heating-drum A, and -also serving to support thehorizontal projection la of the feed-spout. Suitable apertures b5 IOO inthe base-plate B4 admit smoke from the combustion-conduit of the base tothe combustion-conduit of the drum, and also allows the smoke whichpasses through the small central channel 7s of the feed-spout to enterthe combustion-conduit G of the drum. A draft-regulating damper I, tofit the rectangular cross-section ofthe combustion-conduit G,issupported therein by a spindle g,by which it is regulated.

The feed-spout K of the tire-chamber C extends angularly downward fromthe top I) of the base-cap B5 and its junction with the foot of theheating-drum and is closed outwardly by a door or cover G2 and has asmall central channel k within the horizontal projection 7c, upon whichthe air-iiue F is supported, the central channel 7c serving to conductthe Iirst products of combustion beneath the base of said air-Hue to thecombustion-conduit G, a similar superimposed channel k2 connecting thebase of the air-heatin g conduit H with the air-iiue F and also with anair-jacket C around the fire-chamber C,whieh extends to the base thereofnear the fioor and carries off and heats the coldest air of the roomfrom the bottom of the stove, as will hereinafter appear. Thefire-chamber C being double-walled, the outer shell C will not be heatedto a white or equally extreme heat, and the exterior shell of the base Bwill be heated to a degree still less eX- treme, a spiral hot-airchannel B between the base and lire-chamber, formed by the innersheet-metal shell B2,servin g to effectively and rapidly carry on thecirculation and complete commingling of the gases and products ofcombustion,wl1ich is furthered materially by means of heat-dischargeopenings C2 C2 in the upper part of the fire-chamber and otherheat-discharging openings C3 C in the lower part of said fire-chamber.The walls of these openings are inclined upwardly to better carry offthe combustion products and also to prevent the coal from falling outthrough them from the fire-chamber.

Air is admitted to the tire-chamber C through the base B by means of atop draftchannel B3, covered by a screw-regulated register-plate b3, amiddle draft-channel B4, covered by a hinged door having a supplementalregister-plate b4 opening a short distance above the grate M,hereinafter' described, and a bottom draft-channel B5, also having aregister-plate b5 and opening in the ash-pan D below the said grate.

The grate comprises the basket-section M2 and a grate portion properresting upon the flanges m6, the basket-section and grate proper havinghandles m" and m5, by which they are rotated and reciprocated,respectively, in any well-known or preferred manner.

Suitable air channels or openings b in the base admit air from the roominto the hot-air channel B', and similar openings D7 at the foot of thebase admit cold air from near the Hoor by means of lateral channels bsinto the air -jacket surrounding the fire chamber,

stantiallyas follows: The lire-chamber is rst filled with coal throughthe feed-spout nearly or quite to the top thereof and settling withinthe basket-grate and upon the shaking-grate is provided with an extendedgrate-surface. The re when first kindled receives air from the registerbelow the grate, ,and the first smoke and products of combustion pass ofdirectly and rapidly through the channel leading from the feed-spout atthe top of the firechamber to the central air-flue to the chimney, thedamper in the spiral combustion-conduit being properly regulated. Afterthe coal has become thoroughly ignited the less perfectly consumed gasespass out through the upper discharge-openings C2 CZ of the tire-chamber,and the more highly heated gases and iiame pass out from the{ire-chamber through the openings C3 C3 thereof, and eommingling, asshown by the arrows in Fig. l, are conducted together through thehot-air channel B of the base, and thence joining the irst products ofcombustion issuing from the channel of the feed-spout provide a finaland practical combustion of said gases, the large grate area addinggreatly tothe completeness of the combustion. The top draft-channelpermits the air to be supplied and heated at the upper part of the{ire-chamber, and the middle draftchannel, the opening of which isregulated both by a register-plate and a door, admits air to the lowerpart or base of the fire-chamber, and when the full door of the latteris opened will greatly accelerate the combustion and heat of the coalsWithin the fire-pot.

All the conditions required for slow and perfect combustion of everypound of fuel are thus provided, and an extended grate-surface as wellas an extended heating-surface, all under complete control, will in amost perfect manner cause a rapid circulation both of the cold air fromthe floor directly to the most highly heated channels to the warmerstrata above7 and also of the intermediate zone, which is conducted, asshown by the arrows in horizontal lines, through the heating-drum andover the extended spiral surfaces of its air-heating conduit anddischarged through numerous openings extending from the foot to the capof the heating-drum. The air from the upper part of the room above thebase portion of the stove passes into the spiral airconduit H on oneside, and after passing once around is intercepted by the verticalpartitions 7L and discharged4 at the opposite side thereof. Vhen thefire burns briskly, the central air-ue F becomes heated and either allor a portion of the air admitted to lower spiral air-conduit H is drawninto said lue through the channel k2 of the feed-spout, while anysurplus air or air not drawn into the air-Hue F will pass out into theroom through the apertures in the drum leading from the spiralair-conduit. A water-basin IIO - p 599,709 p Y 3.

I claim vas my invention and desire to secure by Letters Patentl. In astove,the combination with the base, of the fire-pot contained therein,and a spiral plate providing a hot-air channel, between ro them, thesaid fire-pot being provided with Y discharge-openings respectivelyabove and below said spiral plate to cause the commingling of the upperand lower products of comlbnstion from the fire-chamber, and aheatingdrum leading from the said hot-air channel,

substantially as described.

2. In a stove, the base in combination with a double-walled fire-chambercontained therein, to provide an annular hot-air channel bezo tweenthem, the said fire-chamber being provided with heat and smoke dischargepassages having upwardly and outwardly inclined walls to prevent thecoal from falling through them from the iir'e-chambervand eX- tendingthrough the said annular hot-air chamber, substantially as described.

3. A stove comprising a base having a firechamber, a spiral air-jacketextending from the foot thereofto a discharge-opening at the 3o topthereof, in combination with a heatingdrum comprising a spiralcombustion-conduit leading from the discharge-opening of the base to thetop of the drum, a series4 of spiral air-heating chambers interposedbetween the oonvolutions ofthe combustion-conduit havingoppositely-disposed apertures in the outer.

Walls of the said chambers to allow theair to pass transversely into andout of said chambers, and a stovepipe leading from the,combustion-conduit, substantially as described.

4. In a stove the combination with a base and inner fire-chamber of acentral air-tube, a spiral combustion-conduit leading from said chamberto the discharge opening, and a feed-funnel leading through the walls ofthe base and nre-chamber having a horizontal pipe leading therefrom tothe base of the spiral combustion-conduit, substantially as described;

5. The combination with a stove-base, of a central fire-chamber, afunnel-section having a horizontally-projecting pipe or conduit, apipe-base thereon and a base-cap provided with a seat for supporting thedrum formed integral, a spiral heating and a spiral combustion conduitcomprising the drum supported upon said funnel-section with the base ofthe spiral combustion-conduit leading from the horizontal pipe oi' thefunnel, and acentral air-pipe supported upon the said funnel-section andsupported Within the drum, substan- MAX JAHN.

Witnesses RUDOLPH FRICKE, OTTO DOEDERLEIN.

